The purpose of this study was to quantitatively determine the indoor infiltration of pollutants of outdoor origin. The relationship between indoor and outdoor air is dependent, to a large extent, on the rate of air exchange between these two environments. Mean indoor/outdoor ratios measured from this study were: 0.70 for HNO_3; 1.60 for HNO_2; 0.56 for SO_2; 1.30 for NH_3; 0.96 for PM_2.5(d_p<2.5μm); 0.89 for SO_4^2-; 0.87 for NO_3^- and 0.79 for NH_4^+. Mean indoor concentrations for PM_2.5, SO_4^2-, HNO_3, NO_3^- and NH_4^+ were similar to outdoor levels. Indoor HNO_2 and NH_3 values were higher than outdoors. However, the indoor level of SO_2 was lower than ambient level.

• 이학성(서원대학교 환경과학과) | Hak-Sung Lee (Dept. of Environmental Science, Seowon University)
• 강병욱(국립청주전문대확 환경공업과) | Byung-Wook Kang (Dept. of EnvironmentaI Industry, ChongJu National Junior CoIlege)